okay so imade a little dev board
it has a 328p driving an lcd
and another zif socket to program a separate 328p
Ive been using it just fine and it uploads my hex files just fine
but last night it burned my only two programmers
I wonder perhaps my understanding of how to wire ISP is wrong?
I assumed the VCC pin of an ISP header goes to the same source that the 328p is getting power from, or does it go to the Power Pin of the uC?
i have provided the image of the board layout, sorry no schematic.
Normally my usbTIny is able to power up the uC , but the MK2 always give me an error and says the device voltage is not where it needs to be so it obviously doesnt power the uC so i have to power it up form another source
with of course common grounds.
an input voltage of 9v is being applied to 7805
and from there i power the chip
and the port that the isp is on is not being used for anything, only portc to drive the lcd
its weird because you figure if something was wrong it wouldnt upload my hex files , but it did,
perhaps leaving the isp header connected while turning on the board fried my USBTINY
but why did it fry the MK2 if it REQUIRES the chip to be externally power since it does not give it juice.
I would really appreciate some insight since i plan to get more programmers now and keep using the board
or make another one but if my understanding of how to route the ISP is wrong then this will become a rather expensive lesson to learn